OZ, NZ, Canada and UK are least safe,because HKIRD are rightly saying that if you work for CX you are automatically HK based even if you are working from an outport. The OECD documents relating to aviation and shipping confirm the validity of the IRD position.
North America has already ruled, in the 49er judgement, that CX crews operating from North America are working for a HK company and are subject to HK employment law.
If Germany goes for social security under a recent EU ruling, FRA will be the next base to close. FRA crews are notionally employed in the UK, (but not really. Only in the imagination of CX basings office), but they start work in Germany and social security is to be paid in the place where your roster normally starts.
OZ, NZ and Canada will wither on the vine for now.
The previous GMA, now in Canada, who is responsible for the basings debacle, has demonstrated a level of incompetence that would get a pilot sacked.